I bought one of these off a friend for £55 but it was in terrible condition, the head was all scratched all over but the performance hadn't been damaged. I have stiff shaft 7.5degrees loft.
Basically, if my best friend asked me about drivers i would tell him to get a small headed driver and let his swing do the work. If he insisted on a big headedd driver i would tell him to get an SZ400.

Quite honestly this club is phenomenal, i hit this club further than the following (please note i am not exaggerating or making stuff up, honestly)
Taylormade: R7 quad, R580, R580XD, burner 860
Titleist: 986k, 905t
callaway: erc fusion+(a gorgeous club to hit tho)
Integra:R1
Cleveland launcher

I have tried all these clubs through friends and the closest any of the clubs got was the 905t which was 5-10yards short on average.
Basically i think the whole golf club industry is a scam because there is basically no difference between 580 and 580xd. and ss430 and sz400
I think the intelligent money is always on the sz400 until maybe the square headed drivers become cheap. This might be controversial but these are my honest findings, thanks